48. The length of a wire is 1.0 m and the area of cross-section is
The length of a wire is 1.0 m and the area of cross-section is 1.0×10-2 cm2 . If the work done for increase in length by 0.2 cm is 0.4 joule, then Young’s modulus of the material of the wire is
(a) 2.0×1010 N/m2 (b) 4×1010 N/m2
(c) 2.0×1011 N/m2 (d) 2×1010 N/m2
Answer-c
(4)